液晶顯示驅(qū)動電路的設(shè)計與實現(xiàn)(4課時)

1、實驗六 液晶顯示驅(qū)動電路的設(shè)計與實現(xiàn)（4課時）實驗?zāi)康?.熟練掌握設(shè)計電路下載到芯片的關(guān)鍵設(shè)置與基本步驟和利用實驗箱上的輸入信號和輸出顯示器件在線測試設(shè)計電路的方法。2.熟悉液晶顯示的原理，了解液晶顯示器件的性能特點、分類參數(shù)。掌握液晶顯示器件的接口時序與通訊格式。3.掌握利用VHDL語言設(shè)計液晶顯示器件驅(qū)動電路的方法。實驗原理1.中文液晶顯示模塊（OCMJ128X32）的引腳說明引腳名稱方向說明其它1VLED+I背光電源正極(LED+5v)2VLED-I背光電源負(fù)極(LED-5v)3VSSI地4VDDI（+5v）5REQI請求信號，高電平有效。6BUSYO應(yīng)答信號=1：已經(jīng)收到數(shù)據(jù)并正在處理

2、中 =0：模塊空閑，可以接受數(shù)據(jù)7-14DB0DB7I數(shù)據(jù)0數(shù)據(jù)72.接口時序說明編號名稱單位最小值最大值說明1TruS0.4-數(shù)據(jù)線上數(shù)據(jù)穩(wěn)定時間2TbuS220最大模塊響應(yīng)時間3TrtuS11-最小REQ保持時間4Ts1uS2045最大數(shù)據(jù)接收時間5Ts2uS-0.1-30最大命令指令處理時間3.用戶命令格式（1）實驗用液晶顯示器模塊（OCMJ）命令幀分為操作碼及操作數(shù)兩部分。（2）字符命令：1、顯示國標(biāo)漢字，2、顯示8X8ASCII字符，3、顯示8X16ASCII字符 圖形顯示命令：4、顯示位點陣，5、顯示字節(jié)點陣 屏幕控制命令：6、清屏，7、上移，8、下移、9、左移、10、右移（3）命

3、令幀 顯示國標(biāo)漢字 命令格式：F0 XX YY QQ WW XX:為以漢字為單位的屏幕行坐標(biāo)值，取值范圍00到07。 YY:為以漢字為單位的屏幕列坐標(biāo)值，取值范圍00到01。 QQ WW：坐標(biāo)位置上要顯示的GB2310漢字區(qū)位碼。4其它未盡內(nèi)容請參見實驗指導(dǎo)書（P188-P200）實驗內(nèi)容與要求1.設(shè)計一個液晶顯示驅(qū)動電路，要求能夠顯示兩行不少于14個字的漢字字符，且具有清屏、左移、上移功能。顯示內(nèi)容自定。（6分）2.設(shè)計一個液晶顯示驅(qū)動電路，要求能夠顯示至少兩個周期的三角波形，并顯示“T=30mS”的字樣。（4分）3.在上述2的基礎(chǔ)上增加顯示方波的功能，且可通過按鍵實現(xiàn)三角波和方波的切換顯示

4、（3）。1.library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; use ieee.std_logic_arith.all; entity zjf1 is port(clk: in std_logic; clear: in std_logic; -清零命令 left: in std_logic; -左移命令 right: in std_logic; -右移命令 busy: in std_logic; -忙信號標(biāo)志 data : out std_logic_vector(7 downto 0); -

5、8位數(shù)據(jù)輸出 req : out std_logic); -請求信號 end entity zjf1; architecture art of zjf1 is signal s:std_logic_vector(31 downto 0); -漢字高位和低位的區(qū)位碼 signal n:std_logic_vector(3 downto 0); -顯示十六個漢字的選擇信號 signal count:std_logic_vector(2 downto 0); -五個字節(jié)命令的計數(shù)器 signal sel:std_logic; -顯示十六個漢字的進(jìn)位時鐘信號 signal gateclock:std_

6、logic; -5個字節(jié)命令的計數(shù)器時鐘信號 signal scanclk:std_logic; -分頻時鐘信號 begin process(clk,scanclk) variable scan: std_logic_vector(20 downto 0); -分頻進(jìn)程 begin if clk'event and clk='1' then if scan="111111111111111111111" then scan:="000000000000000000000" else scan:=scan+1; end if; en

7、d if; scanclk<=scan(3); end process; process(gateclock) -5個字節(jié)計數(shù)器的進(jìn)程 begin if gateclock'event and gateclock='1' then if count="100" then count<="000" else count<=count+1; end if; end if; end process; process (scanclk) is begin if rising_edge(scanclk) then if b

8、usy = '0' then if clear = '1' then data<=x"f4" elsif right='1' then data<=x"f5" elsif left='1' then data<=x"f7" else case count is when "000"=>data<=x"f0" sel<='0' when "001"=>dat

9、a<=s(31 downto 24); when "010"=>data<=s(23 downto 16);sel<='1' when "011"=>data<=s(15 downto 8); when "100"=>data<=s(7 downto 0); when others=>null; end case; end if; gateclock<='1' ELSE gateclock<='0' end if; end

10、 if; end process; req<='1' when gateclock='1' else '0' process(sel) begin if sel'event and sel='0' then n<=n+1; case n is when "0000"=> s<=x"00003416" -分別是"xx,yy,qq,ww" when "0001"=> s<=x"0100292F"

11、; when "0010"=> s<=x"02001A0E" when "0011"=> s<=x"0300291D" when "0100"=> s<=x"04002A0F" when "0101"=> s<=x"05001E16" when "0110"=> s<=x"06003011" when "0111"=&

12、gt; s<=x"07001625" when "1000"=> s<=x"00011037" when "1001"=> s<=x"01013426" when "1010"=> s<=x"0201294E" when "1011"=> s<=x"03011406" when "1100"=> s<=x"04013330

13、" when "1101"=> s<=x"0501282B" when "1110"=> s<=x"06011C32" when "1111"=> s<=x"07012421" when others=>null; end case; end if; end process; end architecture; 2.library ieee;use ieee.std_logic_1164.all;use ieee.std_l

14、ogic_unsigned.all;entity zjf2 is port(clock,busy:in std_logic; req:out std_logic; DATE:out std_logic_vector(7 to 0);end entity zjf2 ;architecture art of zjf2 issignal r: std_logic;signal db,db3,db4: std_logic_vector(7 to 0);signal js:std_logic_vector(3 downto 0);signal n: std_logic_vector(10 to 0);s

15、ignal b,clk1,clk2:std_logic;signal XX,YY:std_logic_vector(7 downto 0);signal sl:std_logic_vector(2 downto 0); begin req<=r; DATE<=db; process(clock) is begin if clock'event and clock='1' then if busy='0' then r<='1' else r<='0' case sl is when "00

16、0"=> db<=X"F2" clk1<='1' when "001"=> db<=XX; clk1<='0' when "010"=> db<=YY; when "011"=> db<=X"F1" clk2<='1' when "100"=> db<=db3; clk2<='0' when "101"

17、;=> db<=X"17"-列 when "110"=> db<=db4; when others =>null; end case; if sl="110" then sl<="000" else sl<=sl+1; end if; end if; end if; end process;process(clk1)-三角波 begin if clk1'event and clk1='1' then -127進(jìn)制 if XX=X"7F&qu

18、ot; then-7f XX<=X"00" else XX<=XX+1; end if; if b='0' then -79進(jìn)制 if YY=X"1F" then-1f b<='1' else YY<=YY+1; end if; elsif b='1' then if YY=X"00" then b<='0' else YY<=YY-1; end if; end if; end if; end process;process(clk2)-字符顯示 begin if clk2'event and clk2='1' then if js="1011" then js<="0000" else js<=js+1; end if; case js is when "0000"=> db3<=X"05" when "0001"